C# Fundamentals · Variables & Data Types · Lesson 6 of 22
Constants with const
Concept
Constants with const
const declares a value that cannot change after it is set, useful for values like a fixed tax rate or maximum size.
By the end of this lesson
- Explain the core idea behind Constants with const.
- Predict output before running a change.
- Test one realistic and one unusual input.
- Use the result to make the next decision.
How to study this page
- 1. Read one concept.
- 2. Change the example.
- 3. Run, compare, and explain.
- 4. Complete the challenge below.
Self-check before continuing
Without looking at the example, describe what changes when you modify one input in Constants with const. Then reopen the editor and prove your explanation with a small test.
You are ready to continue when you can predict, test, and explain the result.
Your turn
Declare a const for a discount percentage and use it in a calculation.
Need a nudge?
Ask about this lesson or your next move. The guide explains the path without taking the work away from you.
Ready for the next lesson?
Mark this lesson complete when you have finished the exercise.
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